Added syndicate creation and invite logic

- Implemented `CreateSyndicate` with transaction support
- Added `InviteToSyndicate` with membership check and invite insert
- Created syndicate invite model and DB logic for accepting/declining
- Ensured consistent error handling with `fmt.Errorf`
- Cleaned up unused invite handlers/routes

handlers/syndicate_invites.go

@@ -3,35 +3,46 @@ package handlers
 import (
 	"database/sql"
 	"net/http"
+	"strconv"
 	"synlotto-website/helpers"
-	"synlotto-website/models"
 	"synlotto-website/storage"
 )
 
 func SyndicateInviteHandler(db *sql.DB) http.HandlerFunc {
 	return func(w http.ResponseWriter, r *http.Request) {
-		syndicateID := helpers.Atoi(r.FormValue("syndicate_id"))
-		recipientUsername := r.FormValue("username")
-		senderID, ok := helpers.GetCurrentUserID(r)
+		userID, ok := helpers.GetCurrentUserID(r)
 		if !ok {
-			helpers.RenderError(w, r, 403)
+			helpers.RenderError(w, r, http.StatusForbidden)
 			return
 		}
 
-		recipient := models.GetUserByUsername(recipientUsername)
-		if recipient == nil {
-			helpers.SetFlash(w, r, "User not found")
-			http.Redirect(w, r, "/account/syndicates", http.StatusSeeOther)
-			return
-		}
+		switch r.Method {
+		case http.MethodGet:
+			syndicateID := helpers.Atoi(r.URL.Query().Get("id"))
+			data := BuildTemplateData(db, w, r)
+			context := helpers.TemplateContext(w, r, data)
+			context["SyndicateID"] = syndicateID
 
-		err := storage.InviteUserToSyndicate(db, syndicateID, recipient.Id, senderID)
-		if err != nil {
-			helpers.SetFlash(w, r, "Failed to invite user")
-		} else {
-			helpers.SetFlash(w, r, "Invitation sent to "+recipientUsername)
+			tmpl := helpers.LoadTemplateFiles("invite-syndicate.html", "templates/syndicates/invite.html")
+			err := tmpl.ExecuteTemplate(w, "layout", context)
+			if err != nil {
+				helpers.RenderError(w, r, 500)
+			}
+		case http.MethodPost:
+			syndicateID := helpers.Atoi(r.FormValue("syndicate_id"))
+			username := r.FormValue("username")
+
+			err := storage.InviteToSyndicate(db, userID, syndicateID, username)
+			if err != nil {
+				helpers.SetFlash(w, r, "Failed to send invite: "+err.Error())
+			} else {
+				helpers.SetFlash(w, r, "Invite sent successfully.")
+			}
+			http.Redirect(w, r, "/account/syndicates/view?id="+strconv.Itoa(syndicateID), http.StatusSeeOther)
+
+		default:
+			helpers.RenderError(w, r, http.StatusMethodNotAllowed)
 		}
-		http.Redirect(w, r, "/account/syndicates", http.StatusSeeOther)
 	}
 }
 

storage/syndicate.go

@@ -228,3 +228,33 @@ func CreateSyndicate(db *sql.DB, ownerID int, name, description string) (int64,
 
 	return syndicateID, nil
 }
+
+func InviteToSyndicate(db *sql.DB, inviterID, syndicateID int, username string) error {
+	var inviteeID int
+	err := db.QueryRow(`
+		SELECT id FROM users WHERE username = ?
+	`, username).Scan(&inviteeID)
+	if err == sql.ErrNoRows {
+		return fmt.Errorf("user not found")
+	} else if err != nil {
+		return err
+	}
+
+	var count int
+	err = db.QueryRow(`
+		SELECT COUNT(*) FROM syndicate_members
+		WHERE syndicate_id = ? AND user_id = ?
+	`, syndicateID, inviteeID).Scan(&count)
+	if err != nil {
+		return err
+	}
+	if count > 0 {
+		return fmt.Errorf("user already a member or invited")
+	}
+
+	_, err = db.Exec(`
+		INSERT INTO syndicate_members (syndicate_id, user_id, is_manager, status)
+		VALUES (?, ?, 0, 'invited')
+	`, syndicateID, inviteeID)
+	return err
+}